Oil-well pump



April 1-, 1924.

E. w. HULSEY OIL WELL PUMP Filed July so. 1923 gwuentoz Ea 7-2 M. Halsey Patented Apr; l, 1924.

srars near, w. HULSEY, or HEALDTON, OKLAHOMA.

OIL-WELL P'UhIP.

Application filed July 30, 1923.

To all whom it may concern:

Be it known that I, EARL W. HuLsEY, a citizen of the United States, residing at Healdton, in the county of Carter and State of @klahoma, have invented certain new and useful Improvements in Oilell Pumps, of which the following is a specification. I

My invention relates to oil well pumping apparatus and in particular to oil well pumps.

Pumps as now extensively used in the art, are of the suction type, and contain standing valves which, as is well known, are continually becoming stuck necessitating the pulling of the tubing. Also the periodical accumulation of sand and paraffin in the pumps as now used requires pulling of the tubing to remedy. By reason of these causes, and wear, the present standard pumps average necessitating pulling of tubing once a week, at the least thirty times per year per well, generally fifty. Each time the pump is pulled there is a loss of approximately four barrels of oil as there is no way of saving the oil pulled with the tubing, and as each joint is unscrewed the well pullers are saturated with oil. Standard pumps now employed will easily aver,- age a loss per year per well of two hundred barrels of oil, and this added to the expense of the operation, is a considerable item of loss to oil companies, each year,

Objects of my invention are; to provide a pump so constructed and arranged that pulling is required only about once a year; to provide such a pump so constructed that at each pulling oil waste is eliminated, as the oil remains in the well; to provide a pump which will not agitate a well, in operation; to provide in such a pump means for automatically clearing sand and paraffin on each working stroke, eliminating sticking and wear; and to provide a pump in which valves are so arranged that they may be reached without pulling the tubing, as at resent.

ne of the most important objects of my invention is the automatic clearing of all sand and parai'fine from the lower portion of the barrel on each downstroke of the plunger. The restricted inlet to the plunger through the scraper, combined with the force of the downstroke, exerts sufiicient pressure to eject all solid deposits and auto- Serial N0. 654,614.

matically entirely clears the lower end of the barrel at the completion of each downstroke.

The invention is comprised in the subject-matter hereinafter described and claimed, and illustrated in the accompanying drawings, of which Figure l is a vertical section through a well equipped with my improved pump,

Figure 2 a vertical section through the pump plunger,

Figure 3 a detail vertical section through the lower end of the pump tubing, with plunger in position, and

Figure 4, a horizontal section on line 4-4 of Figure 3.

The pump is operated on the force principle, and no suction exists therein. In the drawings 1 illustrates the usual well casing, and 2 the ordinary tubing or barrel of the pump. At its lower end the barrel is internally threaded to receive a removable bottom plug 3, which may be removed for cleaning purposes. Approximately twentyone inches above the bottom, the barrel is provided with one or more transverse apertures lin the sides thereof of sufficient width to permit ready fiow of the oil into the barrel. I

Vertically slidable in the barrel is a piston-like plunger consisting of a plurality of detachable sections, preferably three in number, consisting of a tubular body section 5, a lower end scraper section 6 and an upper end section 7, which is detachably secured to the bottom of the pump rod 8. The lower end of the plunger body 5 is internally threaded to receive an externally threaded nipple 9 formed on the scraper section 6, which section below the nipple is of the same'diameter as the plunger body.

it vertical central restricted bore 10 extends through the body of this section and terminates at its upper end in a seat for a ball valve 11 retained in a cage 12 integral with the upper end of the nipple 9.

An important feature of the invention is the construction of the bottom of the plunger. Thelower end of the scraper sec tion 6 is dished inwardly to form a bell shaped bottom, the concave formation providing a peripheral cutting edge 13 at the bottom of the plunger, which will cut paraffin and sand from the barrel wall on each stroke, and by reason of the concavity and restricted bore 10, all sand collecting on the bottom of the barrel Will be forced up the plunger and cleared on each strolre.

This automatic emptying of the bottom of the barrel is caused by the jet action or the oil inlet to the plunger through the restricted bore 10 of the scraper body, supplemented by the concave bottom of the scraper. On the downstroke of the plunger past the aperture l of the barrel an increasing pressure is set up in the bottom of the barrel due to the restricted bore 10, Which is the plunger inlet. The pressureset up agitates the deposits in the oil in the barrel bottom, and the 'jet action through the restricted bore 10 will automatically entirely empty the barrel bottom at the completion of the downstroke of the plunger.

The upper end section 7 of the plunger, is threaded into the body 5 by a nipple llprovided With a central bore terminating in a seat for a ball valve 15 retained in a cage 16. The action of this upper ball valve supplements that of the lovver nain valve 11, and could if desired, be dispensed with. Its purpose is to protect the lower valve during a hook off of the Well, enabling resumption of pumping operations withoutany chance of the lower valve becoming stuck.

In operation, as the plunger is raised, oil will flow into the barrel through the apertures 4:. As the plunger is lowered the lower ball Will be lif'ed from its seat and the oil will be forced in the body of the plunger, carrying with it all sand and foreignmatter accumulating at the bottom of the barrel, by reason o1 the concave bottom of the plunger and restricted bore 10. The action of the top valve is similar to the lower, as is obvious, and repetitions of the stroke will elevate oil in the barrel to the top or the Well.

When access is desired to the valves or plunger, it is merely necessary to withdraw the plunger, and the tubing does not have to be pulled, l he plunger being formed in sections, eliminates the Waste of an entire plunger in replacing Worn parts. The plug 3 in the barrel bottom allows ready cleaning thereor" when the tubing is pulled, which may be once a year.

While in this preferred embodiment, certain details of construction have been described, ll desire it to be understood that the invention is not limited to same, but that any changes modifications may be made therein as will fall within the scope of the invention as claimed.

l claim l. lhe combination in a wells including a barrel bottom and an apertured elongated tubular plunger ii s adapted to move to the bottom or on the dovvnstrolre, a ball valve in the b ttom of said plunger, and a scraper shoe on the lower end of plunger having a concave bottom With a restricted passage through its body, whereby the restricted inlet of the plunger combined with the force of the dovvnst-roke exerts sul'licient pressure to eject all deposits from the barrel bottom on each downstroke.

2. The combination in a pump for oil Wells including a barrel having a closed bottom and an apertured side Wall, of an elon gated tubular plunger in said barrel adapt ed to move to the bottom or the same on the downstrolre, a scraper shoe reinovably connected to the lower end oi said plunger and having a concave bottom with a restricted passage through its body, an integral valve formed on the inner end or said shoe Within the plunger, and a ball valve in said cage adapted to be seated at the inlet end of the restricted passage of the shoe.

ln testimony vvhereol l afix my signature.

EARL W: HULSEY. 

